The old style Foster-style lead slug is best followed by a mix of #00 Buck and more deer slugs. First, second and third shot are deer slugs, last 2 are @00Buck since excitement is UP and accuracy fails at close range.
My last bear attack was at 10:30 at night in dark livestock barn. Bear came at me at full charge, my first shot was 15 feet away, my last was 3 feet away. All 5 shots fired from Ithaca 37 Pump Gun. He may have been dead on third or fourth shot, but was still sliding towards me. 462 pound spring boar bear.